Chemical Reactions

Glucose, is a kind of sugar molecule. How many atoms of hydrogen are in a molecule of glucose?

• 6
• 12
• 24
• 3

Which of the following is NOT a chemical change?

• Burning a match

• Cutting up fruit

• Iron nails rusting

• Baking Cookies

Which of the following is a characteristic of ALL chemical changes?

• a phase change occurs
• light is emitted
• a new material is formed
• some mass is converted to energy

Select all that are chemical reactions:

• A puddle is produced by melting an ice cube

• A new odor is produced by burning a sugar cube

• An odor is produced by milk left out of the refrigerator for a week

• Bubbles are produced when baking soda is mixed with vinegar

What is the evidence of a chemical change in this illustration?

• a precipitate is formed
• a color change
• a temperature change
• gives off light

What is the evidence of a chemical change in this illustration?

• production of light
• freezing
• a temperature change
• gas formation

Select three that are evidence of a chemical reaction:

• Gives off light

• Melts

• Changes smell

• Changes Color

• Freezes

Which model correctly shows an ENDOTHERMIC reaction?

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Which model correctly shows an EXOTHERMIC reaction?

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According to the law of conservation of mass, how much zinc was present in the zinc carbonate? There will be _____ grams of Zn.

• 104 g
• 88 g
• 256 g
• 152 g
• 128 g